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Reddy RR, Subramanian J, Phani Kumar BVN. NMR Studies on the Interaction of Anticancer Drug Doxorubicin with Membrane Mimetic SDS. J Phys Chem B 2022; 126:10237-10248. [PMID: 36383346 DOI: 10.1021/acs.jpcb.2c05909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In the formulation of efficient drug delivery systems, it is essential to unravel the structural and dynamical aspects of the drug's interaction with biological membranes. This has been done for the anticancer drug-membrane system comprising doxorubicin hydrochloride (DOX), a water-soluble anticancer drug, and the micellar sodium dodecyl sulfate (SDS), the latter serving as a useful mimic for membrane proteins. Using a multimodal NMR approach involving 1H, 2H, and 13C as probe nuclei and through the determination of chemical shifts, spin-relaxation, nuclear Overhauser enhancements (NOE), and translational self-diffusion (SD), the binding characteristics of the DOX with SDS have been determined. The perturbation to 13C chemical shifts of SDS indicate the penetration of DOX into the SDS micelle, which is further revealed by 1H-1H NOESY and SD measurements. 2H spin-relaxation measurements and their analysis using a two-step model show DOX induced SDS micellar volume changes, which determine the correlation times involved in the DOX-SDS mobility.
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Affiliation(s)
- R Ravikanth Reddy
- NMR, CATERS, CSIR-Central Leather Research Institute, Chennai600020, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad201 002, India
| | - J Subramanian
- NMR, CATERS, CSIR-Central Leather Research Institute, Chennai600020, India
| | - Bandaru V N Phani Kumar
- NMR, CATERS, CSIR-Central Leather Research Institute, Chennai600020, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad201 002, India
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2
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Zueva OS, Makarova AO, Zvereva ER, Kh. Kurbanov R, Salnikov VV, Turanov AN, Zuev YF. Industrial block copolymer surfactants: Diversity of associative forms and interaction with carbon nanomaterial. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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3
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Hancox E, Derry MJ, Greenall MJ, Huband S, Al-Shok L, Town JS, Topham PD, Haddleton DM. Heterotelechelic homopolymers mimicking high χ - ultralow N block copolymers with sub-2 nm domain size. Chem Sci 2022; 13:4019-4028. [PMID: 35440978 PMCID: PMC8985574 DOI: 10.1039/d2sc00720g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 03/13/2022] [Indexed: 12/16/2022] Open
Abstract
Three fluorinated, hydrophobic initiators have been utilised for the synthesis of low molecular mass fluoro-poly(acrylic acid) heterotelechelic homopolymers to mimic high chi (χ)-low N diblock copolymers with ultrafine domains of sub-2 nm length scale. Polymers were obtained by a simple photoinduced copper(ii)-mediated reversible-deactivation radical polymerisation (Cu-RDRP) affording low molecular mass (<3 kDa) and low dispersity (Đ = 1.04-1.21) homopolymers. Heating/cooling ramps were performed on bulk samples (ca. 250 μm thick) to obtain thermodynamically stable nanomorpologies of lamellar (LAM) or hexagonally packed cylinders (HEX), as deduced by small-angle X-ray scattering (SAXS). Construction of the experimental phase diagram alongside a detailed theoretical model demonstrated typical rod-coil block copolymer phase behaviour for these fluoro-poly(acrylic acid) homopolymers, where the fluorinated initiator-derived segment acts as a rod and the poly(acrylic acid) as a coil. This work reveals that these telechelic homopolymers mimic high χ-ultralow N diblock copolymers and enables reproducible targeting of nanomorphologies with incredibly small, tunable domain size.
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Affiliation(s)
- E Hancox
- Department of Chemistry, University of Warwick Coventry CV4 7AL UK
| | - M J Derry
- Aston Institute of Materials Research, Aston University Birmingham B4 7ET UK
| | - M J Greenall
- School of Mathematics and Physics, University of Lincoln Brayford Pool Lincoln LN6 7TS UK
| | - S Huband
- Department of Physics, University of Warwick Coventry CV4 7AL UK
| | - L Al-Shok
- Department of Chemistry, University of Warwick Coventry CV4 7AL UK
| | - J S Town
- Department of Chemistry, University of Warwick Coventry CV4 7AL UK
| | - P D Topham
- Aston Institute of Materials Research, Aston University Birmingham B4 7ET UK
| | - D M Haddleton
- Department of Chemistry, University of Warwick Coventry CV4 7AL UK
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4
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Nazir S, Naz T, Tahir MN, Rashid MA, Yaseen M, Whitwood AC. Crystallographic evidence of synthesized Ni(II) fluoride complex: Solubilization interaction of fluoride complex in anionic micellar media by conductometric and spectroscopic techniques. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Liu H, Zhang Y, Lv L, Gao X, Meng H, Liu H. Obtaining of Mesoporous Aluminosilicates with High Hydrothermal Stability by Composite Organic Templates: Utility and Mechanism. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9137-9143. [PMID: 34297575 DOI: 10.1021/acs.langmuir.1c01151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We have reported the synthesis of mesoporous aluminosilicates (MAs) with high hydrothermal stability via assembly of basic characteristic structure units of typical microporous zeolite Y. In spite of this, high consumption of organic template and H2O remains a major obstacle to its industrial application. Herein, a facile and effective strategy called "composite templates" was employed to decrease significantly the amount of P123 and H2O. In this method, composite micelles of P123/poly(vinyl alcohol) (PVA) could be more easily dispersed in the solution due to the lowering of water's surface tension caused by the free hydroxyl groups of PVA. Moreover, the improved assembly ability of composite micelles in high concentration solution leads to the synthesis of hydrothermally stable MAs with 45% decrease of organic template P123 and 81% that of water amount. It was found that by the introduction of composite templates, the textural properties such as the surface area of materials, volume of pore, size of pore, and thickness were enlarged simultaneously. Meanwhile, this article presented an understanding into the assembly of composite micelles in the process of synthesis of MAs.
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Affiliation(s)
- Hongtao Liu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Yi Zhang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Anqing Research Institute, Beijing University of Chemical Technology, Anqing City, Anhui Province 246000, P. R. China
| | - Linyi Lv
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Anqing Research Institute, Beijing University of Chemical Technology, Anqing City, Anhui Province 246000, P. R. China
| | - Xionghou Gao
- Petrochemical Research Institute, Petrochina Company Limited, Beijing 100195, P. R. China
| | - Hong Meng
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Honghai Liu
- Petrochemical Research Institute, Petrochina Company Limited, Beijing 100195, P. R. China
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6
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Prameela GKS, Phani Kumar BVN, Subramanian J, Tsuchiya K, Pan A, Aswal VK, Abe M, Mandal AB, Moulik SP. Interaction between sodium dodecylsulfate (SDS) and pluronic L61 in aqueous medium: assessment of the nature and morphology of the formed mixed aggregates by NMR, EPR, SANS and FF-TEM measurements. Phys Chem Chem Phys 2021; 23:13170-13180. [PMID: 34079976 DOI: 10.1039/d0cp06227h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interaction of copolymer L61 i.e., (EO)2(PO)32(EO)2 (where EO and PO are ethylene and propylene oxides, respectively) with surfactant SDS (sodium dodecylsulfate) in relation to their self-aggregation, dynamics and microstructures has been physicochemically studied in detail employing the Nuclear Magnetic Resonance (NMR), Electron Paramagnetic Resonance (EPR), Small-Angle Neutron Scattering (SANS), and Freeze-Fracture Transmission Electron Microscopy (FF-TEM) methods. The NMR self-diffusion study indicated a synergistic interaction between SDS and L61 forming L61-SDS mixed complex aggregates, and deuterium (2H) NMR pointed out the nonspherical nature of these aggregates with increasing [L61]. EPR spectral analysis of the motional parameters of 5-doxyl steraric acid (5-DSA) as a spin probe provided information on the microviscosity of the local environment of the L61-SDS complex aggregates. SANS probed the geometrical aspects of the SDS-L61 assemblies as a function of both [L61] and [SDS]. Progressive evolution of the mixed-aggregate geometries from globular to prolate ellipsoids with axial ratios ranging from 2 to 10 with increasing [L61] was found. Such morphological changes were further corroborated with the results of 2H NMR and FF-TEM measurements. The strategy of the measurements, and data analysis for a concerted conclusion have been presented.
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Affiliation(s)
- G K S Prameela
- Inorganic & Physical Chemistry Laboratory, CSIR - Central Leather Research Institute, Adyar, Chennai-600020, India.
| | - B V N Phani Kumar
- NMR, CATERS, CSIR - Central Leather Research Institute, Adyar, Chennai-600020, India
| | - J Subramanian
- Inorganic & Physical Chemistry Laboratory, CSIR - Central Leather Research Institute, Adyar, Chennai-600020, India.
| | - K Tsuchiya
- Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - A Pan
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India.
| | - V K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
| | - M Abe
- Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - A B Mandal
- Inorganic & Physical Chemistry Laboratory, CSIR - Central Leather Research Institute, Adyar, Chennai-600020, India.
| | - S P Moulik
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India.
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7
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Ojha J, Nanda R, Dorai K. NMR investigation of the thermogelling properties, anomalous diffusion, and structural changes in a Pluronic F127 triblock copolymer in the presence of gold nanoparticles. Colloid Polym Sci 2020. [DOI: 10.1007/s00396-020-04740-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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8
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Ghosh R, Dey J, Kumar BVNP. Thermodynamically stable vesicle formation of biodegradable double mPEG-tailed amphiphiles with sulfonate head group. RSC Adv 2020; 10:32522-32531. [PMID: 35516463 PMCID: PMC9056604 DOI: 10.1039/d0ra05613h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 11/02/2020] [Accepted: 08/03/2020] [Indexed: 11/21/2022] Open
Abstract
The development of efficient, biodegradable and biocompatible surfactants has become a pressing need because of adverse effects of surface-active compounds on the aquatic environment and human health. Cleavable surfactants containing a labile functional group have the ability to eliminate some of these problems. Consequently, PEGylated amphiphiles have found widespread applications in pharmaceutics, household purposes, and drug delivery. Herein we report synthesis and characterization of two novel amphiphiles which to our knowledge are the first examples of double PEG-tailed amphiphiles with an anionic head group. Considering their chemical structure, they are expected to be biodegradable, biocompatible, milder and less irritant than conventional surfactants. The solution behavior of these newly developed amphiphiles was thoroughly investigated in aqueous buffer (pH 7.0) at 25 °C. The surface activity of the compounds in aqueous buffer was studied by surface tension measurements. The self-assembly properties were investigated by various techniques such as fluorescence and NMR spectroscopy, dynamic light scattering, transmission electron microscopy, atomic force microscopy, and isothermal titration calorimetry. Both molecules were found to be surface active in water and exhibit spontaneous vesicle formation in the absence of any additives at room temperature. As in the cases of conventional surfactants, the self-assembly is driven by the hydrophobic effect. The vesicles produced in aqueous media were shown to encapsulate hydrophobic dyes and exhibit structural transitions upon addition of salts. The sensitivity of the vesicles to change in environments qualifies them for potential use in drug delivery. Spontaneous vesicle formation by biodegradable novel double mPEG-tailed amphiphiles.![]()
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Affiliation(s)
- Rita Ghosh
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur-721302
- India
| | - Joykrishna Dey
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur-721302
- India
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9
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Zhao X, Mi X, Chen H, Li J, Hou Z, Liu H, Liu H, Gao X. Efficient Synthesis of Hydrothermally Stable Mesoporous Aluminosilicates Using Trace Amounts of an Anionic Surfactant as a Co-Template. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b03879] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaozheng Zhao
- Petrochemical Research Institute, Petrochina Company Limited, Beijing 100195, P. R. China
| | - Xiaotong Mi
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- CNOOC Research Institute of Refining and Petrochemicals, Beijing 102200, P. R. China
| | - Han Chen
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Jiang Li
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Zhanggui Hou
- CNOOC Research Institute of Refining and Petrochemicals, Beijing 102200, P. R. China
| | - Honghai Liu
- Petrochemical Research Institute, Petrochina Company Limited, Beijing 100195, P. R. China
| | - Hongtao Liu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Xionghou Gao
- Petrochemical Research Institute, Petrochina Company Limited, Beijing 100195, P. R. China
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10
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Phani Kumar BVN, Stapf S, Mattea C. Molecular Dynamics in the Lyophases of Copolymer P123 Investigated with FFC NMR Relaxometry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:435-445. [PMID: 30571920 DOI: 10.1021/acs.langmuir.8b03057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Associative block copolymers of the type (EO) x(PO) y(EO) x (where EO and PO represent ethylene and propylene oxides, respectively) in aqueous solution have far reaching commercial applications such as solubilization, controlled-drug delivery, etc. The molecular dynamics of a self-associating triblock copolymer (EO)20(PO)70(EO)20 (known as P123 with a molecular weight of ∼5800), in aqueous solution (D2O), consisting of various lyotropic liquid crystalline phases such as isotropic micellar, cubic, hexagonal, and lamellar phases, is investigated using the fast field cycling nuclear magnetic resonance (FFC NMR) relaxometry technique in the Larmor frequency range from 5 kHz to 30 MHz. A nuclear spin-relaxation model consisting of chain modes (Rouse modes) and order fluctuation (OF) modes typical for polymers and liquid crystals, respectively, is considered to explain the observed proton magnetic relaxation dispersion (PMRD) data in the lyophases under investigation. The PMRD analysis in both isotropic micellar and cubic phases revealed a Rouse frequency dependence of spin-lattice relaxation rate ( R1), i.e., R1 ∝ -τs ln(ωτs), in the entire frequency range of study. Hexagonal and lamellar phase data show Rouse modes as well as OF modes, leaving the signature of the latter as R1 ∝ ω- p, where p ∼ 0.5 is typical for nematic mesogens. The activation energies were also determined from segmental correlation times in the lyophases of study. To the best of our knowledge, the present FFC NMR relaxometry study is unique and quantitative in unraveling molecular dynamics of the associative copolymer P123 in aqueous solution.
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Affiliation(s)
- Bandaru V N Phani Kumar
- Department of Technical Physics II/Polymer Physics, Institute of Physics , Ilmenau University of Technology , Ilmenau , Germany
| | - Siegfried Stapf
- Department of Technical Physics II/Polymer Physics, Institute of Physics , Ilmenau University of Technology , Ilmenau , Germany
| | - Carlos Mattea
- Department of Technical Physics II/Polymer Physics, Institute of Physics , Ilmenau University of Technology , Ilmenau , Germany
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11
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Hafidi Z, El Achouri M. The Effect of Polar Head and Chain Length on the Physicochemical Properties of Micellization and Adsorption of Amino Alcohol‐Based Surfactants. J SURFACTANTS DETERG 2018. [DOI: 10.1002/jsde.12241] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zakaria Hafidi
- Mohammed V University in Rabat, Laboratoire de physico‐chimie des matériaux inorganiques et organiques, Centre des Sciences des Matériaux, Ecole Normale supérieure‐Rabat Morocco
| | - Mohammed El Achouri
- Mohammed V University in Rabat, Laboratoire de physico‐chimie des matériaux inorganiques et organiques, Centre des Sciences des Matériaux, Ecole Normale supérieure‐Rabat Morocco
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12
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A facile strategy to synthesize hydrothermally stable mesoporous aluminosilicates with significantly decreased organic templates and H2O. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.08.078] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Buchelnikov AS, Hernández Santiago AA, Starodub MA, Mosunov AA, Parkinson JA, Evstigneev MP. Generalized shape-independent approach to studying molecular hetero-assembly in solution using NMR diffusometry. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.05.106] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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15
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Phani
Kumar BVN, Reddy RR, Pan A, Aswal VK, Tsuchiya K, Prameela GKS, Abe M, Mandal AB, Moulik SP. Physicochemical Understanding of Self-Aggregation and Microstructure of a Surface-Active Ionic Liquid [C 4mim] [C 8OSO 3] Mixed with a Reverse Pluronic 10R5 (PO 8EO 22PO 8). ACS OMEGA 2018; 3:5155-5164. [PMID: 31458730 PMCID: PMC6641978 DOI: 10.1021/acsomega.8b00267] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 04/24/2018] [Indexed: 06/10/2023]
Abstract
Physicochemical studies on aqueous mixtures of ionic liquids (ILs) and reverse pluronics are limited. Self-aggregation dynamics and microstructure of a surface-active IL (SAIL), 1-butyl-3-methylimidazolium octylsulfate [C4mim] [C8OSO3], in the presence of a reverse pluronic, PO8EO22PO8 (known as 10R5), were studied using isothermal titration calorimetry (ITC), high-resolution nuclear magnetic resonance (NMR), and small-angle neutron scattering (SANS) methods. Also, cryo-/freeze-fracture transmission electron microscopy was employed to determine the microstructures of SAIL/10R5 mixtures. The ITC and NMR results revealed facilitation of SAIL aggregation in the presence of 10R5 forming mixed aggregates as well as free SAIL micelles. 2H spin relaxation rate data pointed out the onset of slow dynamics of the aqueous SAIL/10R5 mixture with an increase in either the former or the latter. Globular morphologies of the mixed species as well as their individual components were corroborated from the measurements. The preferential location of interaction of the SAIL with the 10R5 was identified from 13C NMR chemical shift findings to be in the interfacial region of the assembled SAIL. The formed species were mixed interacted aggregates but not mixed micelles that arise from mixed surfactants. The physicochemical information acquired herein would enrich the literature on the 10R5/SAIL mixed microheterogeneous systems having importance in the making of useful green drug carrier systems and templates for the synthesis of nanomaterials.
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Affiliation(s)
- Bandaru V. N. Phani
Kumar
- NMR,
Inorganic & Physical Chemistry Laboratory, CSIR−Central Leather Research Institute, Adyar, Chennai 600020, India
- Academic
of Scientific and Innovative Research (AcSIR), CSIR−CLRI Campus, Chennai 600020, India
| | - R. Ravikanth Reddy
- NMR,
Inorganic & Physical Chemistry Laboratory, CSIR−Central Leather Research Institute, Adyar, Chennai 600020, India
- Academic
of Scientific and Innovative Research (AcSIR), CSIR−CLRI Campus, Chennai 600020, India
| | - Animesh Pan
- Centre
for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Vinod Kumar Aswal
- Solid
State Physics Division, Bhabha Atomic Research
Centre, Trombay, Mumbai 400 085, India
| | - Koji Tsuchiya
- Research
Institute for Science and Technology, Tokyo
University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Gorthy K. S. Prameela
- NMR,
Inorganic & Physical Chemistry Laboratory, CSIR−Central Leather Research Institute, Adyar, Chennai 600020, India
| | - Masahiko Abe
- Research
Institute for Science and Technology, Tokyo
University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Asit Baran Mandal
- NMR,
Inorganic & Physical Chemistry Laboratory, CSIR−Central Leather Research Institute, Adyar, Chennai 600020, India
| | - Satya Priya Moulik
- Centre
for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
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16
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Rothbauer GA, Rutter EA, Reuter-Seng C, Vera S, Billiot EJ, Fang Y, Billiot FH, Morris KF. Nuclear Magnetic Resonance Investigation of the Effect of pH on Micelle Formation by the Amino Acid-Based Surfactant Undecyl l-Phenylalaninate. J SURFACTANTS DETERG 2018; 21:139-153. [PMID: 33867787 DOI: 10.1002/jsde.12015] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Micelle formation by the anionic amino acid-based surfactant undecyl l-phenylalaninate (und-Phe) was investigated as a function of pH in solutions containing either Na+, l-arginine, l-lysine, or l-ornithine counterions. In each mixture, the surfactant's critical micelle concentration (CMC) was the lowest at low pH and increased as solutions became more basic. Below pH 9, surfactant solutions containing l-arginine and l-lysine had lower CMC than the corresponding solutions with Na+ counterions. Nuclear magnetic resonance (NMR) diffusometry and dynamic light scattering studies revealed that und-Phe micelles with Na+ counterions had hydrodynamic radii of approximately 15 Å throughout the investigated pH range. Furthermore, l-arginine, l-lysine, and l-ornithine were found to bind most strongly to the micelles below pH 9 when the counterions were cationic. Above pH 9, the counterions became zwitterionic and dissociated from the micelle surface. In und-Phe/l-arginine solution, counterion dissociation was accompanied by a decrease in the hydrodynamic radius of the micelle. However, in experiments with l-lysine and l-ornithine, micelle radii remained the same at low pH when counterions were bound and at high pH when they were not. This result suggested that l-arginine is attached perpendicular to the micelle surface through its guanidinium functional group with the remainder of the molecule extending into solution. Contrastingly, l-lysine and l-ornithine likely bind parallel to the micelle surface with their two amine functional groups interacting with different surfactant monomers. This model was consistent with the results from two-dimensional ROESY (rotating frame Overhauser enhancement spectroscopy) NMR experiments. Two-dimensional NMR also showed that in und-Phe micelles, the aromatic rings on the phenylalanine headgroups were rotated toward the hydrocarbon core of micelle.
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Affiliation(s)
- Gabriel A Rothbauer
- Department of Chemistry, Carthage College, 2001 Alford Park Drive, Kenosha, WI 53140, USA
| | - Elisabeth A Rutter
- Department of Chemistry, Carthage College, 2001 Alford Park Drive, Kenosha, WI 53140, USA
| | - Chelsea Reuter-Seng
- Department of Chemistry, Carthage College, 2001 Alford Park Drive, Kenosha, WI 53140, USA
| | - Simon Vera
- Department of Physical and Environmental Sciences, Texas A&M University-Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX 78412, USA
| | - Eugene J Billiot
- Department of Physical and Environmental Sciences, Texas A&M University-Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX 78412, USA
| | - Yayin Fang
- Department of Biochemistry and Molecular Biology, Howard University College of Medicine, Howard University, 520 W Street NW, Washington, DC, 20059, USA
| | - Fereshteh H Billiot
- Department of Physical and Environmental Sciences, Texas A&M University-Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX 78412, USA
| | - Kevin F Morris
- Department of Chemistry, Carthage College, 2001 Alford Park Drive, Kenosha, WI 53140, USA
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17
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Prameela GKS, Phani Kumar BVN, Reddy RR, Pan A, Subramanian J, Kumar S, Aswal VK, Kohlbrecher J, Mandal AB, Moulik SP. Vesicle to micelle transition in the ternary mixture of L121/SDS/D2O: NMR, EPR and SANS studies. Phys Chem Chem Phys 2017; 19:31747-31755. [DOI: 10.1039/c7cp06796h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Proposed model depicting vesicle to mixed micelle transformation in a ternary mixture of L121/SDS/D2O.
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18
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Ďorďovič V, Tošner Z, Uchman M, Zhigunov A, Reza M, Ruokolainen J, Pramanik G, Cígler P, Kalíková K, Gradzielski M, Matějíček P. Stealth Amphiphiles: Self-Assembly of Polyhedral Boron Clusters. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6713-22. [PMID: 27287067 DOI: 10.1021/acs.langmuir.6b01995] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
This is the first experimental evidence that both self-assembly and surface activity are common features of all water-soluble boron cluster compounds. The solution behavior of anionic polyhedral boranes (sodium decaborate, sodium dodecaborate, and sodium mercaptododecaborate), carboranes (potassium 1-carba-dodecaborate), and metallacarboranes {sodium [cobalt bis(1,2-dicarbollide)]} was extensively studied, and it is evident that all the anionic boron clusters form multimolecular aggregates in water. However, the mechanism of aggregation is dependent on size and polarity. The series of studied clusters spans from a small hydrophilic decaborate-resembling hydrotrope to a bulky hydrophobic cobalt bis(dicarbollide) behaving like a classical surfactant. Despite their pristine structure resembling Platonic solids, the nature of anionic boron cluster compounds is inherently amphiphilic-they are stealth amphiphiles.
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Affiliation(s)
| | | | | | - Alexander Zhigunov
- Institute of Macromolecular Chemistry, v.v.i., Academy of Sciences of the Czech Republic , Heyrovský Sq. 2, 16206 Prague 6, Czech Republic
| | - Mehedi Reza
- Aalto University , Department of Applied Physics Nanotalo, Puumiehenkuja 2, FI-02150 Espoo, Finland
| | - Janne Ruokolainen
- Aalto University , Department of Applied Physics Nanotalo, Puumiehenkuja 2, FI-02150 Espoo, Finland
| | - Goutam Pramanik
- Institute of Organic Chemistry and Biochemistry, v.v.i., Academy of Sciences of the Czech Republic , Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
| | - Petr Cígler
- Institute of Organic Chemistry and Biochemistry, v.v.i., Academy of Sciences of the Czech Republic , Flemingovo nam. 2, 166 10 Prague 6, Czech Republic
| | | | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Sekr. TC 7, Technische Universität Berlin , Strasse des 17. Juni 124, D-10623 Berlin, Germany
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Lin JH, Hou SS. Structure and molecular dynamics of sodium dodecylsulfate micelles modified with hydrophilic short-chain imidazolium salts in aqueous solution. J Colloid Interface Sci 2016; 474:78-87. [DOI: 10.1016/j.jcis.2016.04.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 04/09/2016] [Accepted: 04/11/2016] [Indexed: 11/15/2022]
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20
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Zhang H, Li D, Pei L, Zhang L, Wang F. The Stability of the Micelle Formed by Chain Branch Surfactants and Polymer Under Salt and Shear Force: Insight from Dissipative Particle Dynamics Simulation. J DISPER SCI TECHNOL 2016. [DOI: 10.1080/01932691.2015.1042584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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21
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Reddy RR, Phani Kumar BVN, Shanmugam G, Madhan B, Mandal AB. Molecular Level Insights on Collagen–Polyphenols Interaction Using Spin–Relaxation and Saturation Transfer Difference NMR. J Phys Chem B 2015; 119:14076-85. [DOI: 10.1021/acs.jpcb.5b07911] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- R. Ravikanth Reddy
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110 001, India
| | - Bandaru V. N. Phani Kumar
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110 001, India
| | - Ganesh Shanmugam
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110 001, India
| | - Balaraman Madhan
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110 001, India
| | - Asit B. Mandal
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110 001, India
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22
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Prameela GKS, Phani Kumar BVN, Pan A, Aswal VK, Subramanian J, Mandal AB, Moulik SP. Physicochemical perspectives (aggregation, structure and dynamics) of interaction between pluronic (L31) and surfactant (SDS). Phys Chem Chem Phys 2015; 17:30560-9. [DOI: 10.1039/c5cp04910e] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of the water soluble non-ionic tri-block copolymer L31 on the microstructure and self-aggregation dynamics of the anionic surfactant sodium dodecylsulfate (SDS) in aqueous solution was investigated.
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Affiliation(s)
- G. K. S. Prameela
- Chemical Physics Laboratory and Chemical Laboratory
- CSIR – Central Leather Research Institute
- Chennai-600020
- India
| | - B. V. N. Phani Kumar
- Chemical Physics Laboratory and Chemical Laboratory
- CSIR – Central Leather Research Institute
- Chennai-600020
- India
| | - A. Pan
- Centre for Surface Science
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
| | - V. K. Aswal
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400 085
- India
| | - J. Subramanian
- Chemical Physics Laboratory and Chemical Laboratory
- CSIR – Central Leather Research Institute
- Chennai-600020
- India
| | - A. B. Mandal
- Chemical Physics Laboratory and Chemical Laboratory
- CSIR – Central Leather Research Institute
- Chennai-600020
- India
| | - S. P. Moulik
- Centre for Surface Science
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
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Atanase LI, Winninger J, Delaite C, Riess G. Micellization and demicellization of amphiphilic poly(vinyl acetate)-graft-poly(N-vinyl-pyrrolidone) graft copolymers in the presence of sodium dodecyl sulfate. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.08.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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24
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Pan A, Naskar B, Prameela GKS, Kumar BVNP, Aswal VK, Bhattacharya SC, Mandal AB, Moulik SP. Micellization and related behavior of sodium dodecylsulfate in mixed binary solvent media of tetrahydrofuran (Tf) and formamide (Fa) with water: a detailed physicochemical investigation. SOFT MATTER 2014; 10:5682-5694. [PMID: 24983665 DOI: 10.1039/c4sm00650j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The detailed aggregation behavior of sodiumdodecyl sulfate (SDS) in tetrahydrofuran (Tf)-water (W) and formamide (Fa)-water (W) media at varied volume percent compositions has been investigated. Surface tension (ST), conductance (Cond), viscosity (Visc), isothermal titration calorimetry (ITC), nuclear magnetic resonance (NMR) and small angle neutron scattering (SANS) were used in this study. The presence of nonaqueous solvents affected the critical micelle concentration (CMC) of SDS, the counter-ion binding of the micelle, the energetics of the air/water interfacial adsorption and micellization of the amphiphiles in the bulk, the ion-association (ion-pair, triple-ion, quadruple, etc. between Na(+) and DS(-) ions) as well as the weakly soluble (aggregation less) amphiphile solution. Tf has been observed to produce a "dead zone" or "non-micelle formation zone" in the mixed Tf-W domain of 10-40 vol%. Fa influenced the SDS aggregation up to 70 vol%, at higher proportions (below the Krafft temperature (K(T))), instead of the micelle, "randomly arranged globular assembly" (RAGA) was formed. The correlation of the standard free energy of micellization (ΔG(m)(0)) with different solvent parameters (1) dielectric constant (ε), (2) viscosity (η0), (3) Reichardt parameter (E(T)(30)), (4) Gordon parameter (G), and (5) Hansen-Hildebrand hydrogen bonding parameter (δ(h)) has been attempted. It has been found that δ(h) produced a master correlation between ΔG(m)(0) and δ(h) for different binary mixtures such as Tf-W, Fa-W, Ml-W and Dn-W.
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Affiliation(s)
- A Pan
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India.
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25
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Pinedo-Martín G, Castro E, Martín L, Alonso M, Rodríguez-Cabello JC. Effect of surfactants on the self-assembly of a model elastin-like block corecombinamer: from micelles to an aqueous two-phase system. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:3432-3440. [PMID: 24611880 DOI: 10.1021/la500464v] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Recent advances in genetic engineering now allow the synthesis of protein-based block corecombinamers derived from elastin-like peptide sequences with complete control of chemistry and molecular weight, thereby resulting in unique physical and biological properties. The individual blocks of the elastin-like block corecombinamers (ELbcR's) display different phase behaviors in aqueous solution, which leads to the thermally triggered self-assembly of nano-objects ranging from micelles to vesicles. Herein, the interaction of cationic surfactant dodecyl trimethylammonium bromide (DTAB), anionic surfactant dodecyl sodium sulfate (SDS), and nonionic surfactant octyl-β-glucopyranoside (OG) with an ELbcR has been investigated by dynamic light scattering (DLS), the ζ potential and cryo-transmission electron microscopy (cryo-TEM). At 65 °C and neutral pH in aqueous solution, the ELbcR (E50A40) is associated into micelles with a diameter of 150 nm comprising a hydrophobic (A) core and a hydrophilic (E) anionic (from the glutamic acid residues) corona. The size of these self-assemblies can be controlled by adjusting the cosurfactant concentrations. Although the effects of surfactants on the self-assembly behavior of ELbcR's depend on the hydrocarbon chain length and headgroup of the surfactants, a general tendency to increase in size, which in some cases leads to flocculation and a phase-separated state, is observed. These results support the use of surfactants as a highly interesting means of controlling the self-assembly of ELbcR's in aqueous solution as well as their use in drug delivery and purification processes.
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Affiliation(s)
- Guillermo Pinedo-Martín
- Bioforge Group, University of Valladolid, CIBER-BBN , Paseo de Belén 11, 47011 Valladolid, Spain
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26
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Naskar B, Ghosh S, Moulik SP. Interaction of normal and reverse pluronics (L44 and 10R5) and their mixtures with anionic surfactant sodium N-dodecanoylsarcosinate. J Colloid Interface Sci 2013; 414:82-9. [PMID: 24231088 DOI: 10.1016/j.jcis.2013.10.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 10/01/2013] [Accepted: 10/03/2013] [Indexed: 11/17/2022]
Abstract
Interaction of monomeric normal L44 [(PEO)10(PPO)23(PEO)10]) and reverse 10R5 [(PPO)8(PEO)22(PPO)8] pluronics designated as L and R, respectively, and their mixtures with the anionic surfactant sodium N-dodecanoylsarcosinate (SDDS) in aqueous medium has been studied by tensiometry, conductometry, calorimetry and dynamic light scattering methods. The critical aggregation concentration (CAC), concentration of maximum binding (CS), and the extended critical micelle concentration (CMCe) of SDDS resulted from the interaction have been presented. L has shown the formation of CAC, CS and CMCe, whereas R has shown the absence of CAC but the presence of both CS and CMCe. Micellization of SDDS is an endothermic process whereas the formation of CAC and CMCe is exothermic events, the formation of CS is endothermic. The hydrodynamic diameter (Dh) and zeta potential of L and R, and their SDDS interacted species have been determined. Dh decreased with increasing SDDS concentration for L whereas it was invariant for R. Mixed L and R in varied proportions have been also examined in the solution state to probe into their mutual interaction, and interaction with SDDS. The formation of CAC of their mixtures was absent; CMCe formation was exothermic while that of CS was endothermic like their individuals.
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Affiliation(s)
- Bappaditya Naskar
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
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27
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Lin JH, Chen WS, Hou SS. NMR Studies on Effects of Tetraalkylammonium Bromides on Micellization of Sodium Dodecylsulfate. J Phys Chem B 2013; 117:12076-85. [DOI: 10.1021/jp403616p] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jia-Hsien Lin
- Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
| | - Wen-Shan Chen
- Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
| | - Sheng-Shu Hou
- Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
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28
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Li S, Guo J, Patel RA, Dadlani AL, Leblanc RM. Interaction between graphene oxide and Pluronic F127 at the air-water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:5742-5748. [PMID: 23635085 DOI: 10.1021/la401056t] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Triblock copolymer Pluronic F127 (PF127) has previously been demonstrated to disperse graphene oxide (GO) in electrolyte solution and block the hydrophobic interaction between GO and l-tryptophan and l-tyrosine. However, the nature of this interaction between PF127 and GO remains to be characterized and elucidated. In the present study, we aimed to characterize and understand the interaction between GO and PF127 using a 2-dimensional Langmuir monolayer methodology at the air-water interface by surface pressure-area isotherm measurement, stability, adsorption, and atomic force microscopy (AFM) imaging. Based on the observation of surface pressure-area isotherms, adsorption, and stability of PF127 and PF127/GO mixture at the air-water interface, GO is suggested to change the conformation of PF127 at the air-water interface and also drag PF127 from the interface to the bulk subphase. Atomic force microscopy (AFM) image supports this assumption, as GO and PF127 can be observed by spreading the subphase solution outside the compressing barriers, as shown in the TOC graphic.
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Affiliation(s)
- Shanghao Li
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
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29
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Peng B, Han X, Liu H, Berry RC, Tam KC. Interactions between surfactants and polymer-grafted nanocrystalline cellulose. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2012.12.059] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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30
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Alvares RD, Tulumello DV, Macdonald PM, Deber CM, Prosser RS. Effects of a polar amino acid substitution on helix formation and aggregate size along the detergent-induced peptide folding pathway. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:373-81. [DOI: 10.1016/j.bbamem.2012.09.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Revised: 09/06/2012] [Accepted: 09/24/2012] [Indexed: 12/15/2022]
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31
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Prameela GKS, Phani Kumar BVN, Aswal VK, Mandal AB. Influence of water-insoluble nonionic copolymer E6P39E6 on the microstructure and self-aggregation dynamics of aqueous SDS solution—NMR and SANS investigations. Phys Chem Chem Phys 2013; 15:17577-86. [DOI: 10.1039/c3cp52265b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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32
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Pan A, Naskar B, Prameela GKS, Kumar BVNP, Mandal AB, Bhattacharya SC, Moulik SP. Amphiphile behavior in mixed solvent media I: self-aggregation and ion association of sodium dodecylsulfate in 1,4-dioxane-water and methanol-water media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:13830-13843. [PMID: 22950843 DOI: 10.1021/la303281d] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Mixed aquo-organic solvents are used in chemical, industrial, and pharmaceutical processes along with amphiphilic materials. Their fundamental studies with reference to bulk and interfacial phenomena are thus considered to be important, but such detailed studies are limited. In this work, the interfacial adsorption of sodium dodecylsulfate (SDS, C12H25SO4(-)Na(+)) in dioxane-water (Dn-W) and methanol-water (Ml-W) media in extensive mixing ratios along with its bulk behavior have been investigated. The solvent-composition-dependent properties have been identified, and their quantifications have been attempted. The SDS micellization has been assessed in terms of different solvent parameters, and the possible formation of an ion pair and triple ion of the colloidal electrolyte, C12H25SO4(-)Na(+) in the Dn-W medium has been correlated and quantified. In the Ml-W medium at a high volume percent of Ml, the SDS amphiphile formed special associated species instead of ion association. The formation of self-assembly and the energetics of SDS in the mixed solvent media have been determined and assessed using conductometry, calorimetry, tensiometry, viscometry, NMR, and DLS methods. The detailed study undertaken herein with respect to the behavior of SDS in the mixed aquo-organic solvent media (Dn-W and Ml-W) is a new kind of endeavor.
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Affiliation(s)
- A Pan
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata, India
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Naskar B, Ghosh S, Moulik SP. Solution behavior of normal and reverse triblock copolymers (pluronic L44 and 10R5) individually and in binary mixture. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:7134-7146. [PMID: 22506970 DOI: 10.1021/la3000729] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Solution properties of pluronics L44 or L [(PEO)(10)(PPO)(23)(PEO)(10)] and 10R5 or R [(PPO)(8)(PEO)(22)(PPO)(8)] were studied individually as well in their binary mixtures in aqueous medium. The critical micelle concentration (CMC), critical micelle temperature, and cloud point (CP) were determined. Ideal and nonideal behaviors of their mixtures in the formation of CMC and CP were observed; the energetics of the studied processes were determined. Spectrophotometry, isothermal titration calorimetry and dynamic light scattering (DLS) methods were used for evaluations. Morphologies of the dispersed L, R, and their mixtures along with their polydispersities were determined from DLS measurements. Atomic force microscopy was also employed. The interfacial properties of L and R were investigated forming Langmuir monolayers in a surface balance. The surface pressures (π) generated by the compounds were moderate, the area per molecule was higher for R than L. R has shown antibacterial activity against both gram positive and gram negative bacteria whereas L was inactive in this respect.
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Affiliation(s)
- Bappaditya Naskar
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
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